Cooling device for engines.



G. WOLKE. I

COOLING DEVICE FOR ENGINES.-

APPLICATION FILED 133.24, 1909.

981,733,, Patented Jan. 17, 1911.

2 SHEETS-SHEET 1.

G. WOLKE.

COOLING DEVICE FOR ENGINES.

APPLICATION FILED FEB. 24, 1909.

Patented Jan. 17, 1911.

2 SHEETS-SHEET 2.

HRH moses UNITED STATES PATENT OFFICE.

GEORGE WOLKE, F JACKSONVILLE, ILLINOIS, ASSIGNOB OF ONE-FOURTH TOEDWARD 1. KIRB'Y AND ONE-FOURTH TO WILLIAM K. MGLAUGHLIN, 0FJACKSONVILLE,

ILLINOIS.

COOLING DEVICE FOR ENGINES.

Specification of Letters Patent. Patented Jan. 1'7, 1911.

Application filed February 24, 1909, Serial No. 479,696.

I following is a specification.

My invention relates to improvements in cooling devices for thecylindersof explosive engines, and more particularly to a construction of thecharacter set forth in Letters- Patent' No. 798,247, granted to meAugust 29, 1905, and No. 879,428, patented February 18, 1908.- In bothof these patents a construction was shown wherein the cylinder wasPIOVltlGfl around its circumferencewith a series of cold air pipes,these pipes being formed with orifices opening toward the cylinder andthe pipes being connected to a source of cold air. Thus in the operationof my construction cold air was driven into these pipes and forced fromthe orifice against the exterior walls of the cylinder.

The object of the present invention is to render the constructiondescribed by my previous patents more effective in operation, that is,more effective to cool the cylinder. In the first patented constructionair or cooling medium was drawn into the crank chamber and then forcedinto the distributing pipes for discharge against the cylinder, and inthe second construction the cold air was injected or drawn into thedischarge tubes or pipes by streams or jets of partially heated air. Ifind that while this construction is in many cases efiicient for thepurpose, that the air is likely to be too much heated by being drawninto the crank chamber or forced into the discharge pipes by heated airand hence in this present invention I provide a blower or equivalentair-forcing apparatus driven by the engine which is entirely separateand apart from the crank chamber, this blower being connected to adistributing chamber which surrounds the.

crank chamber, thus ermittin the crank and those portions 0 the mecanism con- My invention also includes improvements in the means wherebythe discharge tubes are attached to the cylinder, and the air chamberfor these tubes formed, and in addition includes an improvement'in theconstruction of the discharge tubes whereby a large; amount ofheat-radiating surface is provided and also whereby the tubes may bereadily inserted and securely held in'position in the radiating flangesor ribs upon the exterior of the cylinder.

In the drawings, Figure 1 is a longitudi-v nal section of an engine andcylinder, the fly-wheel, however, being shown in elevation; Fig. 2 is aplan view of Fig. 1, the cylinder being shown in section; Fig. 3 is avertical section through the rear end of the cylinder and the blowercasing; Fig. 4 is an elevation of one of the discharge tubes showing theinside face thereof; Fig. 5 is a fragmentary section of one of the outerends of the cylinder with one of the tubes in place, the tube being inelevation; Fig. 6 is a plan View of a multi-cylinder engine, showing howmy blower may be applied thereto; Fig. 7 is a fragmentary detail of twoof these cylinders, the air chamber being broken away.

In the drawings 1 denotes a base of any suitable construction andsupporting at its forward end the usual cylinder 2, formed with a seriesof circumferential outstanding ribs or flanges 3. The forward end of thecylinder is closed by the usual head 1, and in the cylinder moves theusual piston'5, of any suitable construction, connected by a pitman 6 tothe crank 7 supported in bearings 8 on the upwardly projecting sidewalls 9 of the base. The crank shaft 10 has on it the usual fly-wheel 11and a band or pulley wheel 12, which rotates with the shaft or fly-wheeland may be made in any desired manner.

The rear end of the cylinder is formed with a' chamber 13, this chamberbeing conveniently made by omitting one of the ribs 3 and connecting thetwo rearmost ribs remaining by a cover plate 1 1, which extends aroundthe cylinder but opens at its bottom into a duct 15 leading to a blowercasing 16, which in the form of the engine shown in ..nected therewithor opening thereon to be cooled by the exterior air.

Fig. 1 is located between the two side pieces of the base 1, and in linewith the axis of the cylinder and engine. Passing through the blowercasing is the shaft 17 mounted in suitable hearings in the sides 1 ofthe base, and 'carryin fan blades 18. These blades may be ma e in anydesired form which will best eonduce to forcing air into the chamber 13.An opening 19 admits air to the blower casing. The end of the shaftcarries the belt pulley 20, which is connected by a band 21 to the bandwheel 12. Extending from the chamber 13 and surrounding the cylinder isa series of air discharge tubes 22. The forward ends of these tubes areblocked or closed, but the rear ends pass through the outer wall of thechamber 13 and open into the chamber. These tubes are provided on theirinside faces with a series of openings 23, which extend from the outerend of the cylinder rearwardly nearly to the inner end thereof,

these openings gradually diminishing in size. The reason forthediminishing size of the openings is that the forward end of thecylinder is of course the hottest and thereby requires a greater amountof cold air to be discharged thereon. The heat of the cylinder graduallydiminishes as it nears the rearward end thereof, and, hence, the holesproportionately diminish, and, indeed, do not extend to the entirelength of the cylinder. Vhile I may attach these tubes to the flanges 3in any desired manner, as by simply inserting them through openings inthe flanges, I preferably form the tubes with exterior ribs whichpreferably also take the form of screw threads as shown in detail inFig. 4. These screw threads are relatively deep and constitute secondaryheat-radiating ribs between the main ribs on the cylinder to cooperatetherewith to very greatly increase the radiating surface of the tubes,thus assisting the flanges 3 to carry off heat from the cylinder, keepthe tubes cool and thus prevent the heating of the air carried thereby.The screw threaded tubes also permit the tubes to be inserted morereadily and held in position more rigidly than if the tubes were simplyinserted through openings in the flanges or ribs 3.

While it is no part of my invention, I have shown this cylinder 2 asprovided with the usualinlet and exhaust valves common to engines ofthis class, the inlet valve being shown as an ordinary suction valve,while the exhaust valve is opened by the usual cam mechanism carriedupon the shaft 10. As this construction forms no part of my invention,is of any usual or desired character, and is well known, no furtherdescription thereof is necessary.

In Figs. 6 and 7 I show my invention as applied to 'a' multi-cylinderengine of any ordinary construction. 25 denotes the cylinders, each ofthe form shown in 1.

ing with the pistons of the cylinders 25. These cranks are containedwithin the'sectional crank case 27. This crank case and the mechanismfor driving the shaft 26 from. the engines being well known, do notrequire any further description. 28 denotes a blower case of any desiredcharacter, having a blower shaft 29 connected by a belt 30 with a beltpulley 31 mounted on the shaft 26. The blower case is connected by aduct 32 with a chamber 33. This chamber corresponds to the chamber 13 inFigs. 1 and 2, and may, like the chamber 13, be conveniently formed byproviding a transversely extending plate or series of plates 34, whichextend across all of the cylinders 25, and through which the ends of allthe cylinders project. The tubes 36 extend through these plates 34, andopen into the interior of the chamber The outer end of the chamber 33 isformed by a plate or series of plates 37 having central openingsreceiving the inner ends of the cylinders 25, and provided with boltswhereby they may be attached to the end plate 38 of the crank case 27these bolts being designated 39, shown in Fig. 6. A plate or plates 40inclose the space between the plates 37 and 34, these plates 40 beingbolted to the plates 37 and 34 by stud bolts passing through openings41.

Of course, it will be understood that I do not wish to limit myself tothe particular construction shown, as other equally good ways ofconnecting the plates 37, 34 and 40 to each other and to the crankcasing 27 may be used.

The operation of my invention in both its forms will be evident.

Air will be drawn in by the blower and will be forced into the chambers13, or 33, and thence forced out through the discharge pipes 22 or 36,and discharged through the openings 23 against the sides of the cylinderor cylinders between the flanges, thus keeping the cylinder perfectlycool at all times and providing for a positive supply of cold airthereto, and also providing for a greatly extended radiating surfacewhereby the heat from the cylinders may be radiated to the exterioratmosphere.

The construction I have shown in Fig. 7 for a multi-cylinder engine isof particular advantage inasmuch as it permits me to combine any numberof cylinders, each cylinder having the square or rectangular flanges 34and 37, these flanges on each cylinder thus being capable of abuttingagainst the like flanges on the next adjacent cylinder 79 I the shaft 10in Figs. 1 and 2, andcarrying, of course, theusual series of cranksconnectthis manner of making the air chamber for l a multi-cylinderengine, but I believe it to be preferable for the reason above stated.

It will be obvious, also, that many changes may be made in the exactdetails of construction without in any manner departing from theprinciple of my invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters-Patent, is:

1. In an engine, the combination of a base, a cylinder supported by andprojecting from the base and provided with a plurality of annularheat-radiating ribs having alined openings therethrough, a tubeexternally threaded throughout its length inserted through and securedin said alined openings and provided between the ribs with portsdischarging against the cylinder, said ports being of graduallydecreasing diameter toward the outer end of the cylinder, a blowermounted on the base adjacent the cylinder and communicating with saidtube, and a driving shaft mounted on the base and driven from thecylinder and connected with the blower.

2. In an engine, the combination of a plurality of cylinders, an airchamber having opposed walls provided with openings into which the innerends of the c linders are fitted, a crank chamber, means or securing thecrank chamber to one of the walls of the air chamber, the opposite wallof the air chami her having apertures extending around each cylinder, aplurality of air tubes mounted on each cylinder with their outer endsclosed and their inner ends disposed in the apertures in the wall of theair chamber, said tubes having openings for discharging air against theouter surface of the cylinders, a blower, and means connecting theblower to the air chamber, said air chamber forming a the crank casing.

3. In an engine, a series of parallel cylinders, each provided with aseries of outwardly projecting radiating ribs, the inner end of eachcylinder being formed with two parallel opposed rectangular flangesspaced apart from each other, the rectangular flanges of each cylinderbeing adapted to be alined and engaged with the rectangular flanges ofthe next adjacent cylinder, a cover plate closing the space between saidflanges and with them inclosing an air chamber, a blower, a connectionbet-ween the blower and said air chamber, and a series of air dischargetubes on each cylinder closed at one end, passing through the series ofradiating ribs and into said air chamber, said tubes being each providedwith perforations opening toward the adjacent cylinder.

In testimony, that I claim the foregoing as my own, I have heretoaiiixed my signature in the presence of two witnesses.

GEORGE WOLKE.

Witnesses:

J. N. G. PIERsoN, CYRUS O. OORNFELDT.

connecting means between the cylinders and

